空指针异常

java.lang.NullPointerException

            at com.example.administrator.festivalsms_imooc.fragment.FragmentCatory$2.onItemClick(FragmentCatory.java:64)

代码

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Intent intent = new Intent(getActivity(), ChooseMsgActivity.class);

                intent.putExtra(ID_FESTIVAL, adapter.getItem(position).getId());

                startActivity(intent);

            }

        });